A081508 Primes of form 1 + 3^k + 5^k.

3, 244672067, 14551915378461487103639747, 3552713678880267372432493847753987, 211758236813575107295480170109084902352995775163267

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..6

Formula

a(n) = A074507(A076515(n)). - Amiram Eldar, Aug 11 2024

Mathematica

Do[s=1^w+3^w+5^w; If[IntegerQ[w/100], Print[{w}]]; If[PrimeQ[s], Print[{w, s}]], {w, 0, 1000}]

Prog

(PARI) lista(kmax) = {my(p); for(k = 0, kmax, p = 1 + 3^k + 5^k; if(isprime(p), print1(p, ", "))); } \\ Amiram Eldar, Aug 11 2024

Crossrefs

Cf. A074507, A076515, A277122.

Sequence in context: A229092 A058469 A367670 * A368722 A067481 A058433

Adjacent sequences: A081505 A081506 A081507 * A081509 A081510 A081511

Keyword

nonn

Author

Labos Elemer, Apr 15 2003

Status

approved